Shoe for rotary ironers



Aug. 22, 1939. DUNHAM 2,170,680

SHOE FOR .ROTARY iRONERS Filed Oct. 30, 1937 Inventor: George W Dunham,

H15 Attovneq.

Patented Aug. 22, 1939 UNITED STATES PATENT OFFICE SHOE FOR, ROTARY IRONERS New York Application October 30, 1937, Serial No. 171,980

1 Claim.

The present invention relates to a shoe for rotary ironers.

Shoes for rotary ironer's comprise a suitably heated metal plate having an arcuate surface 8 which cooperates with a padded roll. Shoes have been customarily'made by forming a sheet of hot rolled mild carbon steel to an arcuate shape and subsequently case hardening the shoe to provide a work contacting surface which would not l:become scratched by buttons and the like on the material being ironed. The case hardening operation invariably caused warping so that a subsequent straightening and grinding operation was necessary.

The object of my invention is to provide an improved construction and method of making a shoe for rotary ironers. I

For a consideration of what I believe to be novel and my invention attention is directed to no the accompanying description and the claim appended thereto.

In the accompanying drawing, Figure 1 is a rear elevation of a rotary ironer equipped with a shoe embodying my invention; Figure 2 is a sectional view taken on line 2-2 of Figure 1; and Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Referring to the drawing, I have shown my invention applied to an ironer having a frame l supporting a suitably padded roll 2. Projecting from the frame is a tubular sleeve 3 in which is journaled a shaft 4 to which is fixed an arm 5 for supporting the shoe 6. The shoe comprises a metal plate 'I having an arcuate surface 8 cooperating with the roll and having longitudinal edges 9 each extending outwardly and forming an acute angle with the adjacent surface of the roll. The edges are connected by a reverse curved portion In having a curvature of the same order of magnitude as the central portion of the shoe. The reverse curved portion III assists in feeding material between the roll and the shoe. It also stiifens the shoe. On the back of the plate 1 is fixed a bracket II which is pivotally connected by a pin l2 to the upper end of the arm 5. Upon oscillation of the shaft 4 the shoe will be moved toward and away from the roll. The connection provided by the pin [2 permits pivotal movement of the shoe to equalize the pressure between the shoe and the roll. The rear surface of the shoe is enclosed by a cover plate 15 which is bolted to studs l6 welded to l the rear side of the plate I. I

The shoe is heated by suitable electric heating elements l3 which are held against the rear side of the plate 1 by a clamping plate It. The plate It is pressed against the heating elements by N clamping members I! and nuts l8. The edges of the cover plate butt against the rear of the surface of the plate I and lie within the longitudinal edges thereof.

The plate 1 is formed from a sheet of twenty- 15 point carbon steel which has been previously cold rolled to provide the desired surface hardness, for example, a.hardness on the Rockwell B-scale of from to 100. The sheet of cold rolled steel is formed to the shape illustrated. The reverse curved portion I0 is necessary to provide a stiffening flange and a feeding edge for the shoe. It has a curvature of the same order as the body of the shoe, permitting the forming of the shoe from harder and more brittle 25 steel without fracture. After forming, the under side of the shoe may be polished and plated. Since the shoe is formed of pre-hardened material, there is no need'for case hardening after forming nor for the subsequent straightening 30 and grinding operations made necessary by warping during the case hardening.

What I claim as new and desire to secure by Letters Patent of the United States is:

A shoe for a rotary ironer comprising a metal 35 plate having an arcuate surface for cooperating with a roll and having the longitudinal edges extending outward at an acute angle to the adjacent surface on the roll, the edges being connected by a reverse curved portion having a cur- 4o vature of substantially the same magnitude as the curvature of the central portion, and a cover plate fastened to and spaced from the rear side of the shoe, the edges of the cover plate butting and lying within the longitudinal edges of the 5 shoe.

GEORGE W. DURHAM. 

